Watts 0121419 Valve

For high-demand commercial hot water applications requiring a robust failsafe, the Watts 0121419 represents the professional standard for temperature and pressure protection. Specifically engineered as the direct updated version for the 0158266, this LF40XL-8-3/4 valve offers a 3/4-inch MNPT inlet and FNPT outlet configuration, designed to integrate seamlessly into commercial water heater tappings or hot water outlets. With a certified pressure relief setting of 125 PSI and a temperature relief of 210°F, it provides dependable protection against catastrophic tank failure. The 8-inch extension thermostat features a unique thermo-bonded coating to significantly reduce mineral scale buildup, a critical factor for long-term reliability in hard water environments. This lead-free brass valve is ASME rated and CSA listed, ensuring complete compliance with modern safety codes and the Safe Drinking Water Act. Utilizing a non-mechanical seat-to-disc alignment and tamper-resistant bonnet screws, the 0121419 provides a stable, automatic reseating solution for veteran contractors who prioritize system integrity and precise T&P relief valve performance.

• Technical Upgrade: Directly replaces the retired 0158266 and 40XL-8-125 models with updated lead-free brass construction.
• Enhanced Durability: The 8-inch extension probe is thermo-bonded to prevent calcification, maintaining accuracy in demanding commercial cycles.
• High Capacity: Optimized for large-scale systems with a CSA temperature relieving capacity of up to 1,217,600 BTU/hr.
• Precision Safety: Features automatic reseating and a manual test lever to verify safety relief valve functionality during routine maintenance.
• Code Compliance: Meets ASME Section IV and ANSI Z21.22 standards for potable water and commercial heating applications.

Is the Watts 0121419 compatible with older 40XL-8 unit tappings?
Yes, as the designated update for the 0158266, this valve maintains the standard 3/4-inch NPT threading and 8-inch probe length, ensuring it fits existing infrastructure designed for the 40XL series.

What is the difference between the 40L and the 40XL-8 models?
The "XL" designation indicates an extended thermostat (8 inches in this model), which is required when the valve is installed in the hot water outlet piping rather than directly into the tank shell.

Under what conditions will this valve discharge water?
The valve is designed to open if system pressure exceeds 125 PSI or if water temperature reaches 210°F. Constant dripping often indicates thermal expansion issues rather than a valve defect.

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Disclaimer: While we strive for 100% accuracy, product data and specifications are subject to change. Please contact our team to confirm compatibility or technical details before purchasing.